Get page by path - honoring permalink settings (urls w/slashes)

Question

Let's say I have a page with the name sample-page.

I can do this:

get_page_by_path('sample-page')

To get that page.

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Now, let's say I want to get a post where the URL to that post is /post/8.

If I do

get_page_by_path('post/8'); // with or without leading slash

I get back null.

How do I retrieve the page/post for any given URL in WP?

Edit: here's a screenshot that might add some clarity to my issue

Given the frontend permalink URL is /post/33, how do I take that string and do the opposite? How do I take /post/33 and get the post from that?

Answer 1

You can use url_to_postid() to get the post ID with the relative page url.

$url = '/page-parent/page/';
$post_id = url_to_postid( $url );

https://developer.wordpress.org/reference/functions/url_to_postid/